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A bid of 4NT "invites" opener to: bid 6NT with a maximum holding of 14 HCP (19 + 14 = 33 which is sufficient) pass with a minimum 12 HCP (20+ 12 = only 32) with partnership agreement, bid 5NT holding 13 HCP - asking partner to bid 6NT with 20 HCP and to pass holding 19 HCP. An opening bid of 2NT shows 20, 21 or 22 HCP.
In many bidding systems the following bid types are limit bids: (1) Natural notrump bids indicating balanced hands within a narrow high card strength range; (2) raises of partner's suit indicating a minimum number of cards in the raised suit, a narrow high card strength range, and likely ruffing values; or (3) rebids of one's own suit ...
Strong notrump after passing (SNAP) is a bridge bidding convention originated by Jeremy Flint and Tony Priday [1] [2] and is a one notrump (1NT) bid by a passed hand in response to a one-level opening by his partner.
Cue bids are used to communicate specific controls (aces or voids, kings and singletons). Once a trump suit has been agreed and the two hands are considered to be strong enough, partners bid the lowest available suit which they control; this process continues until one of the partners has sufficient information to make the contract decision.
The next bid indicates suitability for slam: 3NT: strong (Serious 3NT) 4 ♣ /4 ♦ /4 ♥: cuebid, but not strong (non-serious). 4 ♠: truly minimum. Since Spades are the agreed trump suit, Three No Trump is not usually the best contract. Using Serious Three No Trump, a bid of Three No Trump says "I am Serious about slam", i.e. "I have a good ...
Strong hands, with 19 high card points plus, start with a double and then rebid 2 Notrump (or double) to try to expose a psychic bid. Good 4-4=4-1 distributional hands with a stiff minor suit can start with 2 ♣. Single-suited minor hands often start with double, hoping to be able to play at the two-level. These hands will pass a 2 ♦ asking bid.
The unusual notrump applies the principle that when the natural meaning of a bid is not generally very useful, it is profitable to agree that it means something somewhat opposite. That is, while natural notrump bids show a strong hand with balanced distribution, the unusual notrump shows a weak hand with very unbalanced distribution.
A bid of five notrump shows either: Any two aces, or; One ace, and the kings of all suits previously bid by either partner. A bid of a new suit shows first-round control (ace or void) there, but is not compulsory with such a holding. Six of a previously bid suit shows a desire to play there (holding one ace, or the kings of all bid suits).